A user is someone who has access to your merchant account. A single user can be added to a maximum of 100 Merchant Center accounts.
Account admins can specify any of the following access levels to each user:
Super admin: People with super admin access to Business Manager can't be removed from Merchant Center. For more information about super admin access, see Manage your business as a super admin.
Admin: Admins are people with beyond standard access. Admins may add, remove, or edit people. Only admins can add and remove apps and stores to Merchant Center.
Standard: People with standard access can sign in to Merchant Center and access everything but they won't be able to manage others or add and remove apps and stores.
Email-only access: No account access, but will receive emails based on preferences.
Reporting Manager: People with the reporting manager access level have permissions to view and edit all reports and dashboards within the account. This role is equivalent to the Performance and insights role in Merchant Center.